The gene thymocyte selection-associated high mobility group box protein (TOX) is mapped to human chromosome 8q12.1. TOX belongs to HMG (high-mobility group) box family of DNA-binding proteins. It is mainly expressed in the thymus.
Synonyms: Anti-Thymocyte selection-associated high mobility group box protein TOX; Anti-Thymus high mobility group box protein TOX
Storage: -20C
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Biochem Physiol Actions: Thymocyte selection-associated high mobility group box protein (TOX) is important for T-cell selection, differentiation and maturation. TOX is up-regulated by pre-T cell receptor (TCR) and TCR activation of immature thymocytes. Presence of TOX results in expanded CD8+ and reduced CD4+ single positive thymocyte subpopulation. TOX promoter is hypermethylated in lung and breast cancer lines, resulting in down-regulation of TOX. However, down-regulation of TOX does not affect the proliferation or migration potential of the cells. TOX is required for IL (Interleukin)-15-mediated natural killer (NK) cell differentiation. In addition, TOX affects the expression of T-bet (T-box expressed in T cells) which plays important role in NK differentiation and maturation.
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